What is produced when zinc blende is roasted in air?

In order to bring initial chemical change in the ore,the process of heating of ore below its melting point is known as

The chemical reaction that involves the roasting process is:

Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide?

Consider the following statements:
Roasting is carried out to:
$(i)$ convert sulphide to oxide and sulphate
$(ii)$ remove water of hydration
$(iii)$ melt the ore
$(iv)$ remove arsenic and sulphur impurities
Of these statements:

The mixture obtained from the roasting of copper pyrites is ......... .